High-Capacity Flexible Support Stanchions for a Large Liquid Argon Cryostat
High-capacity flexible support stanchions are utilized in three large (5.2m) liquid argon cryostats to support the cold components. The stanchions serve to (1) transfer the weight of the inner vessel and its contents to the support carriage below the cryostat, (2) provide sufficient flexibility to allow the inner vessel to be cooled to liquid argon (or nitrogen) temperature without resort to a sliding connection, and (3) maintain the alignment of the two vessels about their common vertical centerline. Each stanchion consists of an array of parallel vertical plates attached to top and bottom plates by brazing. Alignment is maintained by orienting the plates such that their normals pass through the vertical centerline of the cryostat. Spherical bearings are used above and below the stanchions to compensate for minor misalignments and to distribute loads evenly. Heat leak into the lower part of the cryostat is minimized by the use of a passive heat intercept located above each stanchion. Features of the design, fabrication, and testing of the stanchions are described.
KeywordsVertical Plate Liquid Argon Heat Leak Vertical Centerline Effective Length Factor
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